SealedBlocBuilder7<Bloc extends BlocBase<State> , State extends Union7<A, B, C, D, E, F, G> , A, B, C, D, E, F, G> class
SealedBlocBuilder
is a special type of BlocBuilder
which
ensures that every possible Bloc
state has a corresponding Widget.
SealedBlocBuilder3<MyBloc, MyState, Loading, Success, Failure>(
builder: (context, states) => states(
(loading) => CircularProgressIndicator(),
(success) => Text('Success: ${success.data}'),
(failure) => Text('Failure: ${failure.error}'),
),
)
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- StatefulWidget
- SealedBlocBuilder7
Constructors
-
SealedBlocBuilder7({Key? key, required SealedBlocWidgetBuilder7<
State, A, B, C, D, E, F, G> builder, Bloc? bloc, BlocBuilderCondition<State> ? buildWhen}) -
SealedBlocBuilder
is a special type ofBlocBuilder
which ensures that every possibleBloc
state has a corresponding Widget.const
Properties
- bloc → Bloc?
-
The bloc that the
BlocBuilderBase
will interact with. If omitted,BlocBuilderBase
will automatically perform a lookup usingBlocProvider
and the currentBuildContext
.finalinherited -
builder
→ SealedBlocWidgetBuilder7<
State, A, B, C, D, E, F, G> -
builder will be called with a BuildContext and the
union of all
Bloc
states and must return a Widget for each possible state.final -
buildWhen
→ BlocBuilderCondition<
State> ? -
An optional buildWhen can be implemented for more granular control over
how often
BlocBuilder
rebuilds. buildWhen should only be used for performance optimizations as it provides no security about the state passed to the builder function. buildWhen will be invoked on each blocstate
change. buildWhen takes the previousstate
and currentstate
and must return a bool which determines whether or not the builder function will be invoked. The previousstate
will be initialized to thestate
of the bloc when theBlocBuilder
is initialized. buildWhen is optional and if omitted, it will default totrue
.finalinherited - hashCode → int
-
The hash code for this object.
no setterinherited
- key → Key?
-
Controls how one widget replaces another widget in the tree.
finalinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
build(
BuildContext context, State state) → Widget -
Returns a widget based on the
BuildContext
and currentstate
. -
createElement(
) → StatefulElement -
Creates a StatefulElement to manage this widget's location in the tree.
inherited
-
createState(
) → State< BlocBuilderBase< Bloc, State> > -
Creates the mutable state for this widget at a given location in the tree.
inherited
-
debugDescribeChildren(
) → List< DiagnosticsNode> -
Returns a list of
DiagnosticsNode
objects describing this node's children.inherited -
debugFillProperties(
DiagnosticPropertiesBuilder properties) → void -
Add additional properties associated with the node.
inherited
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toDiagnosticsNode(
{String? name, DiagnosticsTreeStyle? style}) → DiagnosticsNode -
Returns a debug representation of the object that is used by debugging
tools and by DiagnosticsNode.toStringDeep.
inherited
-
toString(
{DiagnosticLevel minLevel = DiagnosticLevel.info}) → String -
A string representation of this object.
inherited
-
toStringDeep(
{String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a string representation of this node and its descendants.
inherited
-
toStringShallow(
{String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String -
Returns a one-line detailed description of the object.
inherited
-
toStringShort(
) → String -
A short, textual description of this widget.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited